A cylinder ()κύλινδρος , Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6747dcacba8b2c06ce9a02ca3b11cabcdbb85c5e79e5f01eee135cea8af34060. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a66621ae-f84a-431a-a149-b85d4264818b.json and https://artists.proofprofile.net/proofs/artist/a66621ae-f84a-431a-a149-b85d4264818b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).